action.yml

name: Self-Hosted GitHub Actions Runner on Hetzner Cloud
description: A GitHub Action to automatically create Hetzner Cloud servers and register them as self-hosted GitHub Actions runners.
author: Nils Knieling

branding:
  icon: 'server'
  color: 'red'

inputs:
  mode:
    description: >-
      Choose either 'create' to create a new GitHub Actions Runner or 'delete' to delete a previously created one.
    required: true
  github_token:
    description: >-
      Fine-grained GitHub Personal Access Token (PAT) with 'Read and write' access to 'Administration' assigned.
    required: true
  hcloud_token:
    description: >-
      Hetzner Cloud API token with 'Read & Write' permissions assigned.
    required: true
  enable_ipv4:
    description: >-
      Attach an IPv4 on the public NIC (true/false) . If false, no IPv4 address will be attached.
      Warning: The GitHub API requires IPv4. Disabling it will result in connection failures.
    required: false
    default: 'true'
  enable_ipv6:
    description: >-
      Attach an IPv6 on the public NIC (true/false). If false, no IPv6 address will be attached.
    required: false
    default: 'true'
  image:
    description: >-
      Name or ID (integer) of the Image the Server is created from.
    required: false
    default: 'ubuntu-24.04'
  location:
    description: >-
      Name of Location to create Server in.
    required: false
    default: 'nbg1'
  name:
    description: >-
      The name for the server and label for the GitHub Actions Runner (must be unique within the project and conform to hostname rules: '[a-zA-Z0-9_-]').
    required: false
  network:
    description: >-
      Network ID (integer) which should be attached to the Server private network interface at the creation time.
    required: false
    default: 'null'
  primary_ipv4:
    description: >-
      ID (integer) of the IPv4 Primary IP to use.
      If omitted and 'enable_ipv4' is true, a new IPv4 Primary IP will automatically be created.
    required: false
    default: 'null'
  primary_ipv6:
    description: >-
      ID (integer) of the IPv6 Primary IP to use.
      If omitted and 'enable_ipv6' is true, a new IPv6 Primary IP will automatically be created.
    required: false
    default: 'null'
  runner_dir:
    description: >-
      GitHub Actions Runner installation directory (created automatically; no trailing slash).
    required: false
    default: '/actions-runner'
  runner_version:
    description: >-
      GitHub Actions Runner version (omit 'v'; e.g., '2.321.0').
      'latest' will install the latest version.
      'skip' will skip the installation. A working installation is expected in the 'runner_dir'.
    required: false
    default: 'latest'
  runner_wait:
    description: >-
      Wait up to 'runner_wait' retries (10 sec each) for runner registration (default: 10 minutes).
    required: false
    default: '60'
  server_id:
    description: >-
      ID (integer) of Hetzner Cloud Server to delete.
    required: false
  server_type:
    description: >-
      Name of the Server type this Server should be created with.
    required: false
    default: 'cx22'
  server_wait:
    description: >-
      Wait up to 'server_wait' retries (10 sec each) for the Hetzner Cloud Server to start (default: 30 = 5 min).
    required: false
    default: '30'
  ssh_key:
    description: >-
      SSH key ID (integer) or name which should be injected into the Server at creation time.
    required: false
    default: 'null'
  pre_runner_script:
    description: >-
      Specifies bash commands to run before the GitHub Actions Runner starts.
      It's useful for installing dependencies with apt-get, dnf, zypper etc.
    required: false

outputs:
  label:
    description: >-
      This label uniquely identifies a GitHub Actions runner,
      used both to specify which runner a job should execute on via the `runs-on` property and to delete the runner when it's no longer needed.
    value: ${{ steps.hcloud-github-runner.outputs.label }}
  server_id:
    description: >-
      This is the Hetzner Cloud server ID of the runner, used to delete the server when the runner is no longer required.
    value: ${{ steps.hcloud-github-runner.outputs.server_id }}

runs:
  using: "composite"
  steps:
    - name: GitHub Actions Runner in Hetzner Cloud
      id: hcloud-github-runner
      shell: bash
      working-directory: ${{ github.action_path }}
      run: bash action.sh
      env:
        INPUT_ENABLE_IPV4: ${{ inputs.enable_ipv4 }}
        INPUT_ENABLE_IPV6: ${{ inputs.enable_ipv6 }}
        INPUT_GITHUB_TOKEN: ${{ inputs.github_token }}
        INPUT_HCLOUD_TOKEN: ${{ inputs.hcloud_token }}
        INPUT_IMAGE: ${{ inputs.image }}
        INPUT_LOCATION: ${{ inputs.location }}
        INPUT_MODE: ${{ inputs.mode }}
        INPUT_NAME: ${{ inputs.name }}
        INPUT_NETWORK: ${{ inputs.network }}
        INPUT_PRE_RUNNER_SCRIPT: ${{ inputs.pre_runner_script }}
        INPUT_PRIMARY_IPV4: ${{ inputs.primary_ipv4 }}
        INPUT_PRIMARY_IPV6: ${{ inputs.primary_ipv6 }}
        INPUT_RUNNER_DIR: ${{ inputs.runner_dir }}
        INPUT_RUNNER_VERSION: ${{ inputs.runner_version }}
        INPUT_RUNNER_WAIT: ${{ inputs.runner_wait }}
        INPUT_SERVER_ID: ${{ inputs.server_id }}
        INPUT_SERVER_TYPE: ${{ inputs.server_type }}
        INPUT_SERVER_WAIT: ${{ inputs.server_wait }}
        INPUT_SSH_KEY: ${{ inputs.ssh_key }}